Dichotomous keys ask open-ended questions about animal behavior.
open-ended questions about easily observable characteristics.
yes-or-no questions about animal behavior.
yes-or-no questions about easily observable characteristics.

What are the two causes of density in deep current waters? a. salinity (how much salt) of the water and high temperaturesb. salinity (how much salt) of the water and low temperatures c. oxygen content of the water and high temperatures. d. oxygen content of the water and low temperatures

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes

Matched chromosomes carrying information about the same characteristics in the organism are called